INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Price concessions	$ 6,373	$ 6,907
Compensation and benefits	5,889	4,058
Interest limitation carryforward	35,114	39,094
Operating lease liability	23,266	22,644
Net operating losses	97,880	155,922
Other	6,381	8,501
Deferred tax assets before valuation allowance	174,903	237,126
Valuation allowance	(13,151)	(112,085)	$ (109,531)	$ (1,373)
Deferred tax assets net of valuation allowance	161,752	125,041
Deferred tax liabilities:
Accelerated depreciation	(10,602)	(12,593)
Operating lease right-of-use asset	(18,437)	(17,186)
Intangible assets	(61,629)	(67,127)
Goodwill	(36,702)	(28,976)
Other	(7,349)	(2,498)
Deferred tax liabilities	(134,719)	(128,380)
Net deferred tax assets	$ 27,033
Net deferred tax assets (liabilities)		$ (3,339)